HV battery contains lethal voltage (>200V DC). Follow proper isolation & PPE procedures.

and to contact Technical Assistance (TAS) immediately for further investigation. Professional Diagnosis: Use an OBDII reader with specialized apps like Dr. Hybrid

Before you can fix it, you have to understand it. In the Toyota/Lexus diagnostic universe, P1AC000 is a high-voltage system code. It translates to:

The Toyota diagnostic trouble code (DTC) refers to a "Hybrid/EV Battery Cell Low Voltage" condition. This specific code is often triggered when the hybrid control ECU detects that the voltage difference between battery blocks exceeds a specified limit, typically indicating an internal malfunction or imbalance within the high-voltage (HV) battery pack.